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High-barrier-property polyethylene composition, preparation method, film and application

A polyethylene film, high-barrier technology, used in flexible covering, transportation and packaging, packaging, etc., can solve the problems of unsuitable film, low melting point, poor transparency, etc.

Active Publication Date: 2020-06-12
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] CN101535398A discloses a barrier film for food packaging, blended with HDPE with different melt indices and nucleating agents, the barrier performance is greatly improved but the transparency is not good Good, not suitable for high-end fruit and vegetable packaging
CN102597027B discloses 4-methyl-1-pentene alpha olefin copolymer, but the copolymer is an elastomer with a low melting point and is not suitable for films

Method used

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  • High-barrier-property polyethylene composition, preparation method, film and application

Examples

Experimental program
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Embodiment approach

[0021] According to a preferred embodiment of the present invention, the ethylene / 4-methyl-1-pentene copolymer is prepared by a method comprising the following steps:

[0022] Vacuumize and flush the fully dried polymerization device three times. Then vacuumize again, controlled by solenoid valve, fill in ethylene, add reaction solvent toluene, 4-methyl-1-pentene, add methylaluminoxane toluene solution (containing MAO), heat up to 60-80°C, add Metallocene catalyst (such as vinyl bridged bis-indenyl zirconium dichloride) toluene solution, start timing. After 10-20 minutes, turn off ethylene, add acidified ethanol to the reaction solution, stir for more than 6 hours, and filter to obtain a copolymer.

[0023] According to the present invention, it is preferred to select linear low-density polyethylene with the following characteristics: the melt index of the linear low-density polyethylene at 190°C under a load of 2.16kg is 0.1-5g / 10min, preferably 0.2-4g / 10min; 0.90-0.94g / cm ...

Embodiment 1

[0039] This example is used to illustrate the preparation of the polyethylene composition and polyethylene film provided by the present invention.

[0040] 1) Synthesis of ethylene / 4-methyl-1-pentene copolymer.

[0041]Vacuumize and flush the fully dried polymerization device three times. Carry out vacuum again then, solenoid valve control, be filled with the ethene of 1 standard atmospheric pressure, add 19.0 milliliters of reaction solvent toluene, add 1.0 milliliters of 4-methyl-1-pentene, add 9.0 milliliters of methylalumoxane toluene solution (containing MAO 15.0 mmol), the temperature was raised to 70° C., 1.0 ml of toluene solution containing 10.0 micromol of racemic vinyl bridged indenyl zirconium dichloride was added, and timing was started. After 15 minutes, turn off ethylene, add acidified ethanol to the reaction solution, stir for more than 6 hours, filter to obtain the copolymer, dry it in vacuum for 24 hours, and weigh to obtain 2.47 grams of copolymer. The mol...

Embodiment 2

[0046] This example is used to illustrate the preparation of the polyethylene composition and polyethylene film provided by the present invention.

[0047] 1) Synthesis of ethylene and 4-methyl-1-pentene copolymer.

[0048] Vacuumize and flush the fully dried polymerization device three times. Carry out vacuum again then, solenoid valve control, be filled with the ethene of 1 standard atmospheric pressure, add 19.0 milliliters of reaction solvent toluene, add 1.0 milliliters of 4-methyl-1-pentene, add 9.0 milliliters of methylalumoxane toluene solution (containing MAO 15.0 mmol), the temperature was raised to 70° C., 1.0 ml of toluene solution containing 10.0 micromol of racemic vinyl bridged indenyl zirconium dichloride was added, and timing was started. After 15 minutes, turn off ethylene, add acidified ethanol to the reaction solution, stir for more than 6 hours, filter to obtain the copolymer, dry it in vacuum for 24 hours, and weigh to obtain 2.47 grams of copolymer. Th...

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Abstract

The invention belongs to the field of films, and relates to a high-barrier-property polyethylene composition, a preparation method, a film and application. The polyethylene composition is prepared byblending the following raw materials in parts by weight: 70-99.5 parts of linear low density polyethylene and 0.5 to 30 parts of an ethylene / 4-methyl-1-pentene copolymer; wherein the content of the 4-methyl-1-pentene in the ethylene / 4-methyl-1-pentene copolymer is 0.1-10 mol%, and the melting point of the ethylene / 4-methyl-1-pentene copolymer is 105 DEG C to 130 DEG C. The polyethylene film disclosed by the invention has the advantages of obviously reduced water vapor transmission amount, lower haze and higher light transmittance, and is particularly suitable for transparent packaging of fruits, vegetables and the like.

Description

technical field [0001] The invention belongs to the field of films, and more specifically relates to a high-barrier polyethylene composition, a preparation method, a film and applications. Background technique [0002] Fruits and vegetables are important food for human beings and the main source for people to obtain basic nutrients (vitamins, substances, complex carbohydrates, etc.). With the improvement of people's living standards, the requirements for the freshness of fresh fruits and vegetables are getting higher and higher. Fruits and vegetables can continue to carry out life activities such as respiration and transpiration after harvesting, and water loss and nutrient consumption will occur during storage. In fruits and vegetables, moisture is an important component that affects the tenderness, freshness and taste of fruits and vegetables. Transpiration is the main way for fruits and vegetables to lose water after harvesting. Packaging fruits and vegetables can effec...

Claims

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Application Information

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IPC IPC(8): C08L23/08C08J5/18B65D65/38
CPCC08L23/0815C08J5/18B65D65/38C08J2323/08C08J2423/08
Inventor 殷建军王伟唐毓婧侯莉萍贾雪飞姚雪容任敏巧郑萃张韬毅
Owner CHINA PETROLEUM & CHEM CORP
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